Предмет: Геометрия, автор: Аноним

В остроугольном треугольнике ABC высота АН равна 9 корней из 39,а сторона АВ равна 60. Найдите cos B

Ответы

Автор ответа: Аноним

sinB=AH/AB=9√39/60=3√39/20
cosB=√1-sin²B=√1-351/400=√49/400=7/20

Похожие вопросы

Предмет: Английский язык, автор: MEMILOCK

Task 3: Use the verbs in the Past Simple or Present Perfect/Present Perfect Continuous.
1.I (like) _______ him when I was at school.
2.He (live) _______ in New York since 2001.
3.I (not see) _______ Pete last night.
4.I (look for) _______ this book yesterday.
5.I (to watch) _____ this movie for about 2 hours.
Task 4: Use must/mustn’t, may, can/can’t, should/shouldn’t, need/needn’t.
1.Students ___ leave the classroom before the ring bells.
2.Students ___ leave the classroom before the ring bells.
3.___ you pass my pencil to me?
4.You've been driving all day. You ________ be exhausted!
5.You ________ smoke so much. It's bad for your health!
6.I know he speaks five languages, but ________ he speak Arabic?
7.I'm on my way. I ________ be there in about 10 minutes.
8.I ________ afford that.
9.This ________ be dangerous if you don't have the right equipment.
10.You ________ yell at your parents. It's not nice.
Task 5: Fill in the gaps with the reflexive pronouns.
1.Forget it! I’ll do it _____ .
2.She burnt _____ on the oven yesterday.
3.He talks to _____ all the time. It doesn’t mean he’s crazy.
4.We all enjoyed _____ very much on the picnic.
5.The protesters locked _____ in the church and refused to come out.
6.Your sister is very busy, so you’ll have to do this task by _____ .
Task 6: Circle the correct answer.
1.The UK is divided into four parts:
a)England, Scotland, New Zealand, Wales
b)England, Scotland, Ireland, Wales
c)England, Scotland, Northern Ireland, Wales
d)England, Scotland, Southern Ireland, Wales
2.The flag of the UK is called:
a)Union Jack
b)Union Dave
c)Union Jim
d)Crazy Jack

1 год назад

Предмет: Русский язык, автор: Анна16127819

Сочинение описание по картине Толстого цветы фрукты птица

1 год назад

Предмет: Другие предметы, автор: Юрий0309

Как написать мобильный номер в международном формате?

1 год назад

Предмет: Обществознание, автор: vvladizz

общество потребления: правда или вымысел?

7 лет назад

Предмет: Математика, автор: kurmanbayevaalua

Какое число можно умножить чтоб получилось 82

7 лет назад